Patterns of Gene Flow and Genetic Divergence in the Northeastern Pacific Clinidae (Teleostei: Blennioidei), Based on Allozyme and Morphological Data

Stepien, Carol A.; Rosenblatt, Richard H.

doi:10.2307/1446084

Cited by 34 publications

(23 citation statements)

References 32 publications

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“…Similar studies were made by Rosenblatt andParr (1967, 1969) for the genus Paraclinus; Stepien and Rosenblatt (1991) for Gibbonsia and Heterostichus;and Bath (2008) for the genus Parablennius, where some subspecies were raised to species and some others were recognized as synonyms (Hastings and Springer 2009). Nonetheless, the use of additional tools is required (e.g., geometric morphometrics and genetic or molecular analyses) to come to any further conclusions on these particular cases.…”

Section: Discussionsupporting

confidence: 58%

Endemic Fishes of the Cortez Biogeographic Province (Eastern Pacific Ocean)

Palacios-Salgado¹,

Burnes-Romo²,

Tavera³

et al. 2012

Acta Icth et Piscat

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Background. The Cortez Province (CP) is located in the transitional warm-temperate/subtropical region that allows the ichthyological component inhabiting it to be a mixture of elements of different biogeographic affinities. Since the first systematic analysis of the fish fauna of the Gulf of California in the 1960's a major portion of the endemic species was recognized. Subsequently, a total of 31 new endemic species have been described in the CP. This study constitutes an amendment of the fish component of the CP, including the most relevant ecological attributes of the species, along with an updated taxonomic list. Materials and methods. A comprehensive literature review was made, considering current biological knowledge, and taxonomic status of the endemic species from the CP. Those fish species with restricted distribution ranges, falling within the limits of this province, were considered endemic. Additionally, and to recognize the dominant ecological attributes of the CP endemic species, the preferential habitat, bathymetric distribution, the reproduction strategy, and the maximum total length (TL) were recorded. Results. Seventy-nine endemic species were recognized and grouped in 13 orders, 29 families, and 59 genera. Gobiidae (12), Chaenopsidae (8), and Labrisomidae (7) are the families with the highest species richness, and Sebastes (6 species), the most diverse genus. Forty-five percent of the species are associated with coral and rocky reefs, with 35% distributed within the first 10 m depth layer. The dominant reproduction strategies are: oviparous with benthic eggs and pelagic larval phase (48.7%), and oviparous with pelagic eggs (25.6%). More than half of the species (52%) are shorter than 10 cm (total length). Conclusion. The list of endemic species presented in this study is not conclusive, still undescribed species have not been included, detected differences (morphologic and/or genetic) in several species with disjunct populations may increase the diversity of this province.

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Section: Discussionsupporting

confidence: 58%

Endemic Fishes of the Cortez Biogeographic Province (Eastern Pacific Ocean)

Palacios-Salgado¹,

Burnes-Romo²,

Tavera³

et al. 2012

Acta Icth et Piscat

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“…Data from all relevant studies were analysed using sign tests (see below). Marine species were excluded as island populations belong to the same continuous habitat over which they often disperse widely (Stepien & Rosenblatt, 1991;Fevolden, 1992). All data were on independent populations, apart from those for Peromyscus polionotus where the same two island populations were studied by , Garten (1976) and Brewer et a!.…”

Section: Heterozygosity For Neutral Alleles Is Expected Tomentioning

confidence: 99%

Do island populations have less genetic variation than mainland populations?

1997

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Island populations are much more prone to extinction than mainland populations. The reasons for this remain controversial. If inbreeding and loss of genetic variation are involved, then genetic variation must be lower on average in island than mainland populations. Published data on levels of genetic variation for allozymes, nuclear DNA markers, mitochondrial DNA, inversions and quantitative characters in island and mainland populations were analysed. A large and highly significant majority of island populations have less allozyme genetic variation than their mainland counterparts (165 of 202 comparisons), the average reduction being 29 per cent. The magnitude of differences was related to dispersal ability. There were related differences for all the other measures. Island endemic species showed lower genetic variation than related mainland species in 34 of 38 cases. The proportionate reduction in genetic variation was significantly greater in island endemic than in nonendemic island populations in mammals and birds, but not in insects. Genetic factors cannot be discounted as a cause of higher extinction rates of island than mainland populations.

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“…Since this statement by Endler (1977), relatively few studies have evaluated the role of population disjunction on speciation mechanisms for marine organisms (e.g., Stepien and Rosenblatt 1991;Palumbi 1994;Burton 1998;Hellberg 1998). The main reason for the paucity of studies in this area is that only in rare circumstances are the combination of biological and chronological data available.…”

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confidence: 99%

Restricted Gene Flow and Incipient Speciation in Disjunct Pacific Ocean and Sea of Cortez Populations of a Reef Fish Species, Girella Nigricans

2000

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Abstract. Population disjunctions have been proposed to play an important role in speciation processes. In this study, we have examined the possible role of the Pacific Ocean-Sea of Cortez disjunction as a contributing factor to cryptic speciation in a reef fish, the opaleye, Girella nigricans. Mitochondrial control region (D-loop) sequences (380 bp) of 117 individuals completely separated opaleye populations from the Pacific Ocean and the Sea of Cortez. Although opaleye exhibit pelagic larval stages that remain in the water column for several months, gene flow between the Pacific Ocean and the Sea of Cortez was found to be extremely limited (F ST ϭ 0.84, Nm ϭ 0.10). Whereas limited gene flow and reciprocal monophyly suggest that the observed physical and genetic disjunction are potentially contributing to the incipient speciation of Pacific and Sea of Cortez opaleye, moderate levels of D-loop sequence divergence (3.3%) and the absence of fixed allozyme markers challenge this idea. Pacific Coast populations also exhibited restricted gene flow levels (F ST ϭ 0.25, Nm ϭ 1.49) across Punta Eugenia, a recognized oceanographic boundary along the Baja California coast. Thus, opaleye individuals grouped into three clades: one clade in the Sea of Cortez, one Pacific clade south of Punta Eugenia, and one Pacific clade north of Punta Eugenia. Future work in this region will determine if our results can be generalized to other disjunct populations.

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Patterns of Gene Flow and Genetic Divergence in the Northeastern Pacific Clinidae (Teleostei: Blennioidei), Based on Allozyme and Morphological Data

Cited by 34 publications

References 32 publications

Endemic Fishes of the Cortez Biogeographic Province (Eastern Pacific Ocean)

Endemic Fishes of the Cortez Biogeographic Province (Eastern Pacific Ocean)

Do island populations have less genetic variation than mainland populations?

Restricted Gene Flow and Incipient Speciation in Disjunct Pacific Ocean and Sea of Cortez Populations of a Reef Fish Species, Girella Nigricans

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